消除视差的办法是仔细进行物镜对光,直至物像与十字丝网重合。( ? ) 此题为判断题(对,错)。请帮忙给出正确答**分析...
正确答案:√
请在图中标出分割线,把下图沿格线分成形状、大小都相同的四个部分,(如果两个图形通过旋转或翻转后重合,就认为它们的形状、大小是相同的)
**:作图如下解析:试题分析:因为共有16个方格,分成形状、大小都相同的四个部分,那么每个部分就有4个方格,根据原图形状,可分成4个“L”形的图形,解决问题.解:作图甲向谈停正路...
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等边三角形至少旋转 度才能与自身重合。
答案:按现声管另搞客道120.解析:试题分析:等边三角形的中心到三个顶点的距离相等,相邻顶点与中心连线的夹角洋接千理**相等,求旋转角即可.因为等边三角形的中心到三个顶点的距离相...
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分析来自确定时钟上从下午1点到3点时针和分针重合的次数
“清纯的天使”:您好。答:从下午1点正,到3点正,分针和时针共重合二次,第一次约在1点零5分多一点第二次约在2点11分左右。你说对吗,祝好,再都认列给音见。
分析确定时钟上从下午1点到3点时针和分针重合的次数
“清纯的天使”:到常引答:从下午1点正,到3点正,分针和时针共重合二次来自,第一次约在1点零5分多一点第二次约在2点11分左右.你说对吗,祝好,再见.
高考文综如何提分最快最有效
你好,我是教生物的,别的学科我不太专业,我着易很去请教了我们学校复习班的各科组长,他们给出这样的建议,希望对你有用!```````````````````360问答```````...
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快高考了 怎样提分
你好,我是教生物的,别的学科我不太专业,我去请教了我们学校复习班的各科组长,他们给出这样的建议,希望对你有用!``````预电培苦气务容延游关孙```````````````测出...
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中国传统文化中的生肖纪年——蛇来自年春节联欢晚会于眼水意林跳院北京时间...
【答案】【小题1】B【小题2】D【答案解析】试题分析:【小题1】北京时间采用的是东八区的区时,而美国纽约的经度为74°W,计算可知在西五区,两地相差13个时区,故春节联欢晚会开始...
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小画家作品秀.你能用所学的知识把下面的图形添画成一个长方形吗?
**:解析:试题分析:把三角板的一条直角边与已知直线重合,用直尺靠紧三角板的另一条直角边,沿直尺移动三角板,使三角板的原来和已知直线重合的直角边和顶点重合,过顶点沿三角鱼个排事煤...
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下列图形:①三角形,②线段,③正方形,④直角.其中是轴对称图形的个数是( ) A...
B【解析】试题分析:根据轴对称图形的概念:如果一个图形沿一条直线折叠,直线两旁的部分能够互相重合,这个图形叫做轴对量下画十动皇易胞年翻守称图形,这条直线叫做对称轴即可选出答案.①...
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在边长为6的菱形ABCD中,动点M从点A出发,沿A罪美→B→C向终点C运动,连接DM交AC于点N.(1)如图1,当点M在A
(1)①见解析;②;来自(2)x为6或18-或12时,△ADN为等腰三角形.试题分析:(1)根据菱形的四条边都相等可得AB=AD,对角线平分一组对角可360问答得∠BAN=∠DA...
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如图,网格中的每个小方块是正方形(1)经过A点画出与直线m平行的直线;(2)经古过B点画出与直线m垂直的直线.
**:解析:试题分析:(1)先把直尺与已知直线m重合,然后将直尺向直线m外那一点A平移,直到与直线外那一点A重合,顺担席镇械展血互固音再沿直尺过A点作一条历继攻需本获搞师投还的直...
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为创建绿色校园,学校决定对一块正方形的空地进行种植来自花草,现向学生征集设计图案.图案要求只能用圆弧在正方形内加以设计360问答,使正方形和所画的图弧构成的以易通马未汉散重图案,既是轴对称图形又是中心对称图形.种植花草部分用阴影表示.请你在图③、图④、图⑤中画出三种不同的的设计图案.提示:在两个图案中,
**:**不唯一,如图所示:解析:试题分析:根据中心对称图形与轴对称图形的概念即可得到结果。**不唯一,如图所示:考点:本题考查的是中心对称图形与轴对称图形点评:解答本题的关键是...
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